<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2014 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: 麦当苗儿 <zuojiazi@vip.qq.com> <http://www.zjzit.cn>
// +----------------------------------------------------------------------
namespace Think;

class Page {
	public $firstRow; // 起始行数
	public $listRows; // 列表每页显示行数
	public $parameter; // 分页跳转时要带的参数
	public $totalRows; // 总行数
	public $totalPages; // 分页总页面数
	public $rollPage = 11; // 分页栏每页显示的页数
	public $lastSuffix = true; // 最后一页是否显示总页数
	private $p = 'p'; // 分页参数名
	private $url = ''; // 当前链接URL
	private $nowPage = 1;
	
	// 分页显示定制
	private $config = array (
			'header' => '<span class="rows">共 %TOTAL_ROW% 条记录</span>',
			'prev' => '<<',
			'next' => '>>',
			'first' => '1...',
			'last' => '...%TOTAL_PAGE%',
			'theme' => '%FIRST% %UP_PAGE% %LINK_PAGE% %DOWN_PAGE% %END%' 
	);
	
	/**
	 * 架构函数
	 * 
	 * @param array $totalRows
	 *        	总的记录数
	 * @param array $listRows
	 *        	每页显示记录数
	 * @param array $parameter
	 *        	分页跳转的参数
	 */
	public function __construct($totalRows, $listRows = 20, $parameter = array()) {
		C ( 'VAR_PAGE' ) && $this->p = C ( 'VAR_PAGE' ); // 设置分页参数名称
		/* 基础设置 */
		$this->totalRows = $totalRows; // 设置总记录数
		$this->listRows = $listRows; // 设置每页显示行数
		$this->parameter = empty ( $parameter ) ? $_GET : $parameter;
		$this->nowPage = empty ( $_GET [$this->p] ) ? 1 : intval ( $_GET [$this->p] );
		$this->nowPage = $this->nowPage > 0 ? $this->nowPage : 1;
		$this->firstRow = $this->listRows * ($this->nowPage - 1);
	}
	
	/**
	 * 定制分页链接设置
	 * 
	 * @param string $name
	 *        	设置名称
	 * @param string $value
	 *        	设置值
	 */
	public function setConfig($name, $value) {
		if (isset ( $this->config [$name] )) {
			$this->config [$name] = $value;
		}
	}
	
	/**
	 * 生成链接URL
	 * 
	 * @param integer $page
	 *        	页码
	 * @return string
	 */
	private function url($page) {
		return str_replace ( urlencode ( '[PAGE]' ), $page, $this->url );
	}
	
	/**
	 * 组装分页链接
	 * 
	 * @return string
	 */
	public function show() {
		if (0 == $this->totalRows)
			return '';
			
			/* 生成URL */
		$this->parameter [$this->p] = '[PAGE]';
		$this->url = U ( ACTION_NAME, $this->parameter );
		/* 计算分页信息 */
		$this->totalPages = ceil ( $this->totalRows / $this->listRows ); // 总页数
		if (! empty ( $this->totalPages ) && $this->nowPage > $this->totalPages) {
			$this->nowPage = $this->totalPages;
		}
		
		/* 计算分页零时变量 */
		$now_cool_page = $this->rollPage / 2;
		$now_cool_page_ceil = ceil ( $now_cool_page );
		$this->lastSuffix && $this->config ['last'] = $this->totalPages;
		
		// 上一页
		$up_row = $this->nowPage - 1;
		$up_page = $up_row > 0 ? '<a class="prev" href="' . $this->url ( $up_row ) . '">' . $this->config ['prev'] . '</a>' : '';
		
		// 下一页
		$down_row = $this->nowPage + 1;
		$down_page = ($down_row <= $this->totalPages) ? '<a class="next" href="' . $this->url ( $down_row ) . '">' . $this->config ['next'] . '</a>' : '';
		
		// 第一页
		$the_first = '';
		if ($this->totalPages > $this->rollPage && ($this->nowPage - $now_cool_page) >= 1) {
			$the_first = '<a class="first" href="' . $this->url ( 1 ) . '">' . $this->config ['first'] . '</a>';
		}
		
		// 最后一页
		$the_end = '';
		if ($this->totalPages > $this->rollPage && ($this->nowPage + $now_cool_page) < $this->totalPages) {
			$the_end = '<a class="end" href="' . $this->url ( $this->totalPages ) . '">' . $this->config ['last'] . '</a>';
		}
		
		// 数字连接
		$link_page = "";
		for($i = 1; $i <= $this->rollPage; $i ++) {
			if (($this->nowPage - $now_cool_page) <= 0) {
				$page = $i;
			} elseif (($this->nowPage + $now_cool_page - 1) >= $this->totalPages) {
				$page = $this->totalPages - $this->rollPage + $i;
			} else {
				$page = $this->nowPage - $now_cool_page_ceil + $i;
			}
			if ($page > 0 && $page != $this->nowPage) {
				
				if ($page <= $this->totalPages) {
					$link_page .= '<a class="num" href="' . $this->url ( $page ) . '">' . $page . '</a>';
				} else {
					break;
				}
			} else {
				if ($page > 0 && $this->totalPages != 1) {
					$link_page .= '<span class="current">' . $page . '</span>';
				}
			}
		}
		
		// 替换分页内容
		$page_str = str_replace ( array (
				'%HEADER%',
				'%NOW_PAGE%',
				'%UP_PAGE%',
				'%DOWN_PAGE%',
				'%FIRST%',
				'%LINK_PAGE%',
				'%END%',
				'%TOTAL_ROW%',
				'%TOTAL_PAGE%' 
		), array (
				$this->config ['header'],
				$this->nowPage,
				$up_page,
				$down_page,
				$the_first,
				$link_page,
				$the_end,
				$this->totalRows,
				$this->totalPages 
		), $this->config ['theme'] );
		return "<div>{$page_str}</div>";
	}
}
